Pop singer Gavin DeGraw was viciously beaten by a pack of thugs on the Lower East Side early today — and then hit by a taxi as he stumbled off, police sources said.

The 34-year-old crooner — who’s spent the summer opening for superstar rockers Maroon 5 and Train — had been drinking and just left a group of pals when he was attacked by the marauding perps sometime between 3:50 and 4:20 a.m. at 6th Street and 1st Avenue, the sources said.

He had his nose broken and suffered cuts on his face, they said.

The creeps then fled, and the dazed singer, whose hit song “Chariot” went platinum, kept walking, sources said.

He wound up at 19th Street and 1st Avenue, where he was struck by a cab, although not seriously, they said.

He remained in Bellevue Hospital tonight.

The sources said the attack did not appear to be a robbery.

DeGraw, who hails from upstate South Fallsburg, has a Manhattan pad. He and his brother also own a bar, the National Underground, on East Houston Street.